nocturne isnt really from TT, he just popped out of some guys mind from the power of the nexus. It happened to be a nexus on treeline
and maokais just kindof a tree. He doesnt even want to be a champion, he just wants to be a big tree. If he had been animated from something special from the shadow isles it'd make sense, but apparently its just from magic from the rune wars. Dont think the altars would really have anything to say to him, lol. I think they just made him from TT because it has 'tree' in the title.
Everyone else has some kind of major connection to the shadow isles